Brewiak, Maciej
Current rating: 1544
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1566 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 419 | Kruk, Kamil (1500) | Lost 1-2 | -191547 |
| 2sealed | 606 | Sulzycki, Konrad (1499) | Won 2-0 | +171564 |
| 3sealed | 305 | Sutherland, Thomas (1552) | Lost 1-2 | -181546 |
| 4sealed | 395 | Fijalkowski, Bartosz (1476) | Won 2-0 | +171563 |
| 5sealed | 231 | Sandri, Christian (1542) | Lost 0-2 | -191544 |
| top | average opponent: 1514record: 2-3 | new rating: 1544 | ||
| Grand Prix London 2018 (RIX limited) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 7 | Kopfli, Hugo (1457) | Lost 1-2 | -191505 |
| 2sealed | 555 | Schumacher, Bernd (1481) | Won 2-0 | +171522 |
| 3sealed | 759 | Helbig, Martin (1682) | Won 2-1 | +211543 |
| 4sealed | 118 | Aston, Chris (1752) | Lost 1-2 | -141529 |
| 5sealed | 583 | Allseitz, Brandin (1510) | Won 2-0 | +171546 |
| 6sealed | 528 | Steiner, Alexander (1569) | Lost 1-2 | -171529 |
| 7sealed | 513 | Reay, Christopher (1630) | Won 2-1 | +201549 |
| 8sealed | 422 | Mayjonade-Christy, Marylou (1523) | Won 2-0 | +171566 |
| top | average opponent: 1576record: 5-3 | new rating: 1566 | ||
| Grand Prix Warsaw 2014 (JOU limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 270 | Lepieszko, Klaudia (1500) | Won 2-0 | +181518 |
| 2sealed | 167 | Jurmann, Aadi (1575) | Won 2-0 | +191537 |
| 3sealed | 59 | Szczytkowski, Bartek (1500) | Lost 0-2 | -191518 |
| 4sealed | 113 | de Jong, Bob (1505) | Won 2-1 | +181536 |
| 5sealed | 93 | Nissen, Steffen L (1519) | Won 2-1 | +181554 |
| 6sealed | 140 | Heiss, Marvin (1614) | Lost 0-2 | -171537 |
| 7sealed | 170 | Frentz, Robert (1543) | Won 0-0 | +181555 |
| 8sealed | 129 | Flis, Grzegorz (1694) | Lost 0-2 | -151540 |
| 9sealed | 175 | Tetzlaff, Leonard (1665) | Lost 0-2 | -161524 |
| top | average opponent: 1568record: 5-4 | new rating: 1524 | ||